Are you kidding? Nitrogen dioxide is what comes out of your engine, silly... N2O is laughing gas, and NO2, well, you don't really wanna breathe that in. (Although I would like funnybone2 to inhale NO2!)
FFS!!!!!! Get the symbol correct! I'm sorry to sound rude, but I get really pissed when people dont know the correct chemical symbol. I mean, covalent bonds are the easiest to do!
Please note that I am not trying to insult you, I am just trying to make a statement in general.